Is it possible that the deciding factor in Afghanistan will be the casualty figures for NATO personnel?

I believe that the decision to remain in Afghanistan will be decided by public opinion related to the casualty figures. If the Taliban keep on killing and wounding NATO personnel than eventually the countries involved will be forced by public opinion to stop sending them. Think of this there are usually around 100 killed every month but about 6 times as many wounded every month. The NATO troops are limited in the use of indirect fire weapons but the Taliban are not. As the taliban get better and better weapons soon they will control the battlefield and NATO troops will have their rifles against Taliban who have rockets and mortars. When that happens than it will be time to leave.